Question

What is Gibbs free energy?

A) The result of the product of the temperature and entropy of a change, subtracted from the enthalpy of the change.


B) The result of the product of the temperature and enthalpy of a change, subtracted from the entropy of the change.


C) The result of the product of the temperature and entropy of a change, added to the enthalpy of the change.


D) The result of the product of the temperature and enthalpy of a change, added to the entropy of the change.

Answer 1

Answer: A) The result of the product of the temperature and entropy of a change, subtracted from the enthalpy of the change.

Explanation: Gibbs Free energy gives us the net work done in the whole system.

It is given by the product of change in entropy of the system and temperature maintained of the system minus the change in enthalpy of the system.

Mathematically, it can be written as -

ΔG = ΔH - TΔS

where ΔG = change in gibbs free energy,

ΔH = change in enthalpy

ΔS = change in entropy

T = temperature of the system.

The units of the gibbs free energy is kJ/ mol or J/mol.

Answer 2

The answer is A. In chemistry, Gibbs Free Energy is defined as the enthalpy of the system minus the product of the temperature times the entropy of the system. To write it as a formula, G = H - TS, delta G=delta H-T*delta S, where delta denotes the change.